1 min 80 f t = 7 min x f t ∣ cross m u lt i pl y 1 ⋅ x = 80 ⋅ 7 x = 560 ( f t ) ← an s w er
x=560
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After diving for 7 minutes at a rate of 80 feet per minute, the submarine reaches a depth of 560 feet. This is calculated by multiplying the rate by the time. Therefore, the answer is 560 feet.
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